**Core Concept**
Klippel-Trenaunay syndrome (KTS) is a rare congenital disorder characterized by the combination of vascular malformations, soft tissue and bone hypertrophy, and skin changes. It is a phakomatosis, a group of disorders involving the skin, nervous system, and blood vessels.

**Why the Correct Answer is Right**
KTS is associated with various complications due to its vascular nature. The condition typically involves port wine stains, varicose veins, and lymphedema. The skin changes and vascular malformations are thought to result from an abnormal development of the lymphatic and venous systems. The syndrome often presents with a triad of symptoms: vascular malformations, soft tissue hypertrophy, and overgrowth of the affected limb.

**Why Each Wrong Option is Incorrect**
**Option A:** While KTS is primarily associated with venous malformations, it can also be linked to arterial malformations. However, this is not as common as venous involvement.
**Option B:** Hemangiomas are a common feature of KTS, and they often occur in conjunction with the port wine stains and varicose veins.
**Option C:** Arteriovenous malformations (AVMs) are not a typical feature of KTS. AVMs are more commonly associated with other conditions, such as Osler-Weber-Rendu syndrome.

**Clinical Pearl / High-Yield Fact**
KTS often presents with a characteristic triad of symptoms: vascular malformations, soft tissue hypertrophy, and overgrowth of the affected limb. It is essential to recognize this triad to diagnose KTS accurately.

**Correct Answer:** C. Arteriovenous malformations (AVMs) are not a typical feature of KTS.